used_by_makefile : list_all.txt
	split -l 50 list_all.txt;
	mv xaa list_page1.txt;
	mv xab list_page2.txt;
	mv xac list_page3.txt;
	mv xad list_page4.txt;
	mv xae list_page5.txt;
	mv xaf list_page6.txt;
	touch used_by_makefile; 
